hal: Fix initial audio loss in voice calls

Remove redundant CSD client API call which is taking more than
600msec due to socket realted failures. The csd_get_sample_rate
API is only meant for I2S based external modem.

Bug: 16550747
Change-Id: I696846188b0b3815efdb7bc0905ac68c5195899b
diff --git a/hal/voice.c b/hal/voice.c
index ecc607d..278f0fb 100644
--- a/hal/voice.c
+++ b/hal/voice.c
@@ -102,7 +102,6 @@
     int i, ret = 0;
     struct audio_usecase *uc_info;
     int pcm_dev_rx_id, pcm_dev_tx_id;
-    uint32_t sample_rate = 8000;
     struct voice_session *session = NULL;
     struct pcm_config voice_config = pcm_config_voice_call;
 
@@ -130,13 +129,6 @@
         ret = -EIO;
         goto error_start_voice;
     }
-    ret = platform_get_sample_rate(adev->platform, &sample_rate);
-    if (ret < 0) {
-        ALOGE("platform_get_sample_rate error %d\n", ret);
-    } else {
-        voice_config.rate = sample_rate;
-    }
-    ALOGD("voice_config.rate %d\n", voice_config.rate);
 
     ALOGV("%s: Opening PCM playback device card_id(%d) device_id(%d)",
           __func__, adev->snd_card, pcm_dev_rx_id);